add Files.ReadWrite graph permission

### Problem Statement

we don't want Claude having access to SharePoint at all so we have revoked "Sites.Read.All / Files.Read.All / Files.ReadWrite.All" this still allows user OneDrive read access which is fine.
unfortunately this stops Claude from being able to write to the users OneDrive

### Proposed Solution

add support for "Files.ReadWrite" which should allow Claude the ability to write to the users OneDrive whilst still blocking access to SharePoint

### Alternatives Considered

_No response_

### Area

Other

### Priority

High - Major improvement needed

### Additional Context

_No response_